Personalized I'm 1 Teddy Bear Toddler Long Sleeve T-Shirt. I'm 1! A cute teddy bear holds balloons to let the world know I'm 1. Cute birthday gift for your one year old. A classic for Fall, Winter and Spring, these long sleeve toddler t-shirts are sure to be a staple in your child's wardrobe. Whether layered or alone, this t-shirt is soft yet durable enough to stand up to your toddler's playtime demands.